Belkovite Mineral Data

Belkovite Mineral Data
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General Belkovite Information

Help on Chemical Formula: Chemical Formula: Ba3(Nb,Ti)6(Si2O7)2O12
Help on Composition: Composition: Molecular Weight = 1,407.69 gm
   Barium    29.27 %  Ba   32.68 % BaO
   Titanium   6.80 %  Ti   11.35 % TiO2
   Niobium   26.40 %  Nb   37.77 % Nb2O5
   Silicon    7.98 %  Si   17.07 % SiO2
   Oxygen    29.55 %  O
            ______        ______ 
            100.00 %       98.86 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba3Nb4Ti22(Si2O7)O12
Help on Environment: Environment: Of secondary origin, formed by the alteration of barium-rich pyrochlore during dolomitization of calcite carbonatites in pyroxenites.
Help on IMA Status: IMA Status: Approved IMA 1989 (Dana # Added)
Help on Locality: Locality: In the Vuoriyarvi carbonatite complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For I.V. Bel'kov (1917-1989), Soviet mineralogist who explored the Kola Peninsula, Russia.
Help on Name Pronunciation: Name Pronunciation: Belkovite + Pronunciation Say BELKOVITE
Help on Synonym: Synonym: ICSD 39223
  IMA1989-053
  PDF 45-1404
 

Belkovite Image

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Belkovite

Comments: Brown hypidiomorphic granular grains of belkovite in tonalite.
Location: Seblyavr Massif, Kola, Russia. Scale: Not Give - 2 cm?.
© Diederik Visser

Belkovite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.86694
Help on Cell Dimensions: Cell Dimensions: a = 8.996, c = 7.799, Z = 1; V = 546.60 Den(Calc)= 4.28
Help on Crystal System: Crystal System: Hexagonal - Ditrigonal DipyramidalH-M Symbol (6 m2) Space Group: P 62m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.937(1), 3.888(0.51), 7.81(0.35),
Click Here for Large Belkovite Structure Window Crystal Structure:

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Choisnet J , Nguyen N , Groult D , Raveau B , Materials Research Bulletin , 11 (1976) p.887-894, De nouveaux oxydes a reseau forme d octahedres NbO6 (TaO6) et de groupes Si2O7:, Les phases A3Ta6Si4O26 (A = Ba,Sr) et K6M6Si4O26 (M = Nb,Ta), Locality: synthetic

 

Physical Properties of Belkovite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown.
Help on Density: Density: 4.16
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white
 

Optical Properties of Belkovite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2255,KPDmeas= 0.232,KC= 0.2231
Ncalc = 1.93 - 1.96
Help on Optical Data: Optical Data: Uniaxial (+), w=1.928, e=2.002, bire=0.0740.
 

Calculated Properties of Belkovite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.89 gm/cc
note: Specific Gravity of Belkovite =4.28 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEBelkovite = 171.58 barns/electron
U=PEBelkovite x rElectron Density= 667.74 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Belkovite is Not Radioactive
 

Belkovite Classification
Help on Dana Class: Dana Class: 55.04.03.01 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04)with cations in [8] and lower coordination
  (55.04.03)Dana Group
 
55.04.03.01 Belkovite! Ba3(Nb,Ti)6(Si2O7)2O12 P 62m 6 m2
Help on Strunz Class: Strunz Class: 09.BE.75 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.75 Belkovite! Ba3(Nb,Ti)6(Si2O7)2O12 P 62m 6 m2
 

Other Belkovite Information
Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)
Help on See Also: See Also: Links to other databases for Belkovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Belkovite

Ba3(Nb,Ti)6(Si2O7)2O12
Dana No: 55.04.03.01 Strunz No: 09.BE.75
Locality:

 

Notes: